170results about "Surface tension analysis" patented technology

The invention relates to the technical field of processing, testing or inspection of aircraft parts, and provides a method for detecting surface defects of an aluminum alloy plate with an epoxy coating. The method comprises the following steps: applying an epoxy coating doped with a zinc yellow pigment to an anodic oxide film to construct a coating test piece with a color difference indication function, and placing the coating test piece in a coastal atmospheric environment for exposure sampling. In the detection process, the gloss loss rate, the chromatic aberration, the contact angle, the defect area proportion and the corrosion current density are collected, a dynamic correction coefficient is calculated according to the hydrolysis degree of the zinc yellow pigment, all parameter thresholds are adjusted in a self-adaptive mode, and a threshold set is constructed. And in combination with scanning electron microscope image segmentation and Tafel extrapolation analysis, multi-source indexes are fused to judge whether the coating is invalid. According to the method, the hydrolysis behavior of the zinc yellow pigment can be tracked in real time, the judgment standards of optical, morphology and electrochemical indexes are automatically corrected, and the accuracy and reliability of failure detection of the epoxy coating aluminum alloy plate under the coastal service condition are improved.

The present disclosure relates to methods and apparatus for characterising an interaction between a stimulus and a liquid thin film. An aspect of the disclosure provides a spectroscopic ellipsometry apparatus for characterising an interaction between a stimulus and a liquid thin film, the apparatus comprising: a stimulator, configured to provide a stimulus to a liquid thin film disposed on a volume of liquid to generate a wave in the liquid thin film, the liquid thin film and the volume of liquid having an interface therebetween, light beam optics for illuminating an area of the liquid thin film with a light beam, the light beam having a first polarisation, and a light collector coupled to a detector for receiving the light beam after reflection by the liquid thin film, the light beam having a second polarisation after reflection by the liquid thin film; a wave measurement module coupled to the light collector and configured to provide surface wave data to characterise a Lucassen wave in the liquid thin film based on the second polarisation.

The invention discloses a method and a device for measuring a dynamic contact angle of liquid on a solid surface. The method comprises the following steps: constructing a to-be-measured system containing a first liquid phase, a fluid phase and a solid phase; immersing the to-be-detected surface of the solid phase in the environment phase upwards or downwards; an end surface object is arranged opposite to the to-be-detected surface, and the two are immersed in the same environment phase; the relative distance and position of the two are adjusted, and a longitudinal fluid bridge is formed through the liquid adding device; the camera device obtains a fluid bridge interface contour image from the side surface; horizontally moving the surface of the end surface object or the solid phase, and applying transverse lateral dragging acting force to the fluid bridge to promote the fluid bridge to deform and contact the peripheral line to move or be about to move; and recording the time sequence change of the image, analyzing and calculating to obtain the time change relationship between the contact angle value and the three-phase contact point position value, and further determining the static, forward and backward contact angles and the contact angle hysteresis value. The method is simple and accurate, has wide applicability, and can cover reliable dynamic contact angle data measurement from hydrophilic to super-hydrophobic surfaces.

The present invention discloses a bionic regulation method for a number of bounces of a droplet on a metal surface based on acoustic in-situ monitoring, which comprises the following steps: obtaining dynamic contact characteristics and acoustic properties of a solid-liquid interface of metal superhydrophobic surfaces with different surface information in the droplet bounce process based on an optical-acoustic synchronous in-situ testing system for droplet bounces; and obtaining a correlation among the metal superhydrophobic surface, the acoustic response and the droplet bounce behavior based on the dynamic contact characteristics and the acoustic properties of the solid-liquid interface, and machining and modifying a micro-nano structure of the metal surface by combining a coupled bionic concept according to the correlation. A scientific basis and a novel design method are provided for the bionic regulation of the number of droplet bounces over the metal surface.

The invention discloses an experiment-numerical value-machine learning fusion-based in-oil liquid drop electric field dynamics modeling and regulation method, which comprises the following steps of: firstly, constructing a high-voltage electric field liquid drop experiment system, and testing oil liquid drop experiment data in oil; then establishing a multi-physics field coupling model, and describing deformation and flow field evolution of oil drops in oil under a strong electric field; and finally, constructing a BP neural network and optimizing an initial weight and a threshold value to realize rapid prediction of the deformation behavior of the oil drops in the oil under the action of the electric field. According to the method, an experimental characterization-numerical solution-machine learning optimization three-layer collaborative system is constructed, a whole-process closed loop from physical property determination, equation solution to algorithm prediction is realized, and droplet deformation, charge distribution and interface response are rapidly predicted under the conditions of different electric field intensities, temperatures and emulsifier concentrations; and active control of electric field behaviors can be realized through parameter reverse adjustment, and reliable modeling and optimization basis is provided for an electrowetting chip, a flexible EHD pump and a microfluidic liquid drop regulation and control system.

The invention relates to the technical field of model construction, in particular to a displacement fluid and shale rock imbibition law numerical simulation method and system. According to the method, by quantitatively analyzing the linear correlation degree of granularity and experimental capillary constant distribution and the disturbance degree of local feature points, regularization parameters of a regression algorithm are dynamically adjusted, and on the basis of accurately-calibrated capillary constants, a contact angle is determined by combining permeability characteristic data of probe liquid, so that the permeability of the probe liquid is determined. According to the method, shale surface free energy is obtained through surface energy component theoretical model decoupling, the interface action state of displacement fluid, shale and crude oil is reflected through a three-phase contact angle determined through a three-phase equilibrium relation, and the adhesion work needed by shale oil stripping is obtained. According to the method, the high-precision fitting model of the granularity and the capillary constant is established, and the surface energy component theory is combined, so that more accurate calculation of the shale oil stripping adhesion work is realized, and a reliable numerical simulation basis is provided for improving the shale oil recovery ratio.

This invention discloses a hydrophobicity rating system for superhydrophobic surfaces of energy equipment, relating to the field of hydrophobicity rating technology. The system includes a data acquisition module, an optimal parameter combination module, a sample preparation module, a hydrophobicity quantification and evaluation module, a test closed-loop calibration module, and a hydrophobicity rating classification and output module. These modules are interconnected, and through their collaborative operation, the system quantifies, performs closed-loop calibration, and classifies the hydrophobicity index of superhydrophobic samples of energy equipment with different microstructures. The closed-loop calibration process fully considers both anti-icing and weather resistance, significantly improving the accuracy and generalization ability of the hydrophobicity rating results. This solves the problems of inaccurate evaluation results and inability to adapt to extreme field conditions caused by traditional evaluation systems relying solely on conventional laboratory environments, single physical tests, and empirical thresholds for rating. This enhances the intelligence level of hydrophobicity rating evaluation for superhydrophobic surfaces of energy equipment.

The present invention relates to a rheo-optical method for the mechanical characterization of cellular spheroids and biopsies of biological tissues through: • The use of samples without special preparations; • The execution of compression tests with a load (weight) within standard plates for cell cultures; • The possibility of applying the load (weight) using inexpensive and easily obtainable equipment; • The possibility of conducting the tests in a sterile environment; • The acquisition of images of the sample and their analysis for calculating the elastic and viscous modulus.

The utility model discloses a paper and water contact angle test sample pretreatment table device which comprises a working table, a sample table arranged at the top of the working table, mucilage glue arranged on the side wall of the sample table in a surrounding mode, a tension sensor used for monitoring tension changes of paper in real time arranged in the sample table, and a plurality of inclined track grooves formed in the periphery of the sample table. A linear motion sliding table is installed in the inclined rail groove, a telescopic rod is installed on a sliding plate of the linear motion sliding table, the output end of the telescopic rod is vertically upward and provided with a clamp used for clamping paper, an annular cutter is further arranged above the sample table, and the inner diameter of the annular cutter is smaller than the outer diameter of the sample table. The two ends of the annular cutter are connected with a lifting air cylinder arranged on the workbench. A bubble level for leveling the workbench is also arranged on one side of the sample table; by means of the design, the technical problems that in a traditional treatment mode, complex pretreatment, such as flat layer coating or special paper adopting, usually needs to be conducted on paper, the operation difficulty is high, and a test result deviates from a true value are solved.

The invention discloses an optimal selection method of a surfactant for an oil reservoir, and belongs to the technical field of oil development. The optimal selection method comprises the following steps: preparing N pretreated parallel plunger samples, displacing a simulated oil layer with crude oil, aging the plunger samples under a formation condition until the plunger samples reach the wettability of an oil reservoir, and sampling and measuring an initial contact angle; performing oil displacement on the N aged plunger samples by using N surfactants to obtain corresponding oil displacement efficiency, and sampling and measuring a contact angle; comprehensive indexes are calculated based on the oil displacement efficiency, the contact angle and the initial contact angle, and the surfactants are sorted according to the comprehensive indexes. According to the method, a parallel plunger sample is selected to carry out an oil displacement efficiency experiment by adopting different surfactants in a simulated oil layer state, the performance of the surfactant is evaluated based on the oil displacement efficiency experiment and indexes such as wettability and oil displacement efficiency obtained before and after oil displacement implementation, finally a comprehensive index is selected, and the surfactant is preferably selected based on the comprehensive index.

The invention provides application of droplet merging induced bounce and a solid surface energy measuring system and method, and belongs to the technical field of surface science and precision measurement. Firstly, the invention provides an application of a droplet combination induced bounce phenomenon in solid surface energy measurement. Secondly, the invention provides a measuring system which comprises a liquid drop distribution unit, a merging induction unit, a high-speed image acquisition unit and a data processing and analyzing unit. Finally, a measuring method is provided, two liquid drops with similar sizes are prepared on the surface of a solid, and the liquid drops are induced to be combined and bounce; relevant parameters are extracted, and a Young's equation contact angle of the smooth surface is obtained based on an energy conservation model and a Cassie-Baxter model; and the total surface energy of the super-hydrophobic solid is obtained by simultaneously solving dispersion and polar components of the surface of the super-hydrophobic solid by using data of at least two liquids. According to the method, the surface energy is measured by using liquid drops and bounce, and the defect of low-surface-energy material measurement by a traditional contact angle method is overcome.

The invention discloses a teaching solid-liquid contact angle software and hardware measurement system based on a seating drop method, and the system comprises a hardware device and a software interaction and algorithm, the device can achieve the manual rotation of an XY plane and a YZ plane and the manual translation of an X axis and a Z axis, and the software interaction and algorithm comprises the steps: S1, enabling a plane where a camera is located to be perpendicular to a plane where a liquid drop is located, and carrying out the photographing to obtain a liquid drop picture; s2, carrying out graying processing on the liquid drop picture; s3, performing multi-stage interactive cutting on the grayed picture; s4, a Canny edge detection algorithm or a thresholding method is adopted, the contour extraction of the cut picture is completed through shading, iterative optimization is carried out, and liquid drop contour data are output; s5, drawing a liquid drop contour line on the grayscale image, drawing a base line, and calculating to obtain contact angle data; software provided by the invention is point-and-play, and the software can be matched and cooperated with designed hardware to complete a contact angle data acquisition function, and can also be independently used to process a liquid drop picture to obtain a contact angle numerical value.

The invention discloses a resin-glass fiber coupling flow simulation test method which comprises the following steps: acquiring rheological characteristic parameters of resin and physical characteristic parameters of glass fiber, and measuring interface characteristic parameters; defining a plurality of glass fibers as equivalent fiber bundle flow units, and calculating physical characteristic parameters of the equivalent fiber bundle flow units; constructing a resin flow field model, and performing multi-scale simulation on the movement of the equivalent fiber bundle flow unit; constructing a motion equation of the equivalent fiber bundle flow unit, and outputting a motion velocity vector; and constructing a control equation of the resin flow field, outputting the distribution density of local equivalent fiber bundle flow units at different positions in the coupling flow process of the equivalent fiber bundle flow units and the resin flow field model, and further simulating the distribution density condition of the glass fibers when the glass fibers and the resin are mixed and flow under different conditions. The effect of mixed flowing of glass fibers and resin in different shapes is simulated, and effective guidance is provided for optimization of a composite material forming process.

The provided method includes: determining an energy parameter and a co-volume parameter of a pure gas by a PR state equation, and determining a material parameter and a co-volume parameter of a mixed gas by a Waals one-fluid mixing rule and a combination rule; determining a Helmholtz free energy density and an equilibrium density of the pure gas by a Wertheim molecular association theory, and determining Helmholtz free energy and an equilibrium density of a (H2+N2) mixed gas with different components by a density mixing rule; determining an influence parameter of the pure gas by a gradient theory (GT), and determining an influence parameter of the mixed gas by the influence parameter of the pure gas and an interaction coefficient; simplifying a GT model; and obtaining the surface tension of the (H2+N2) / H2O system at different temperatures by combining the LGT model and the PR state equation.

This invention discloses a device for measuring the surface tension coefficient of liquids based on surface waves. The invention includes a light box, an imaging box, a vibration table, and a signal generator. The light box has a light-emitting hole at the top, housing a built-in light-emitting diode (LED), and a plano-convex lens is arranged in the optical path. The imaging box is a height-adjustable enclosure with an open bottom and a diffuser on the top. The vibration table includes two identical resonant horns positioned on opposite sides of the light-emitting hole, and a light-transmitting plate mounted on the two horns; a light-transmitting water tank is movably mounted on the light-transmitting plate. The two resonant horns are connected to the signal generator via a power amplifier and vibrate at the same frequency. The LED is connected to the signal generator via a strobe light controller and flashes pulses at the same frequency. The diffuser produces bright and dark fringes, and the surface tension coefficient of the liquid under test is obtained by measuring the distance between two bright fringes. This invention achieves high measurement accuracy with a simple device, and has advantages such as safety and reliability, making it suitable for experimental teaching in higher education institutions.

The invention discloses a method and system for monitoring a bubble contact angle in real time in a bubble impingement model, and belongs to the field of contact angle measurement. The problem that an existing contact angle monitoring method is not accurate is solved. According to the technical scheme, the method comprises the following steps: inversely fixing the surface of a to-be-tested sample in an experimental tank with a preset exposure area, and reserving a preset distance between the wall surface of the to-be-tested sample and a bubble generation channel at the bottom of the experimental tank so as to meet the space requirements of bubble generation and collision; the output end of the bubble generation channel outputs a single independent bubble, and a camera is started to record the collision dynamic process of the bubble and the wall surface of the to-be-detected sample; selecting a dynamic endpoint on the surface of the bubble in an image shot by a camera, calculating a dynamic angle in real time through a three-point method, and establishing a correlation model of the dynamic angle and a contact angle; the method is applied to the bubble collision model.

This invention discloses a method for predicting the dispersibility of titanium dioxide in plastics, comprising the following steps: Step 1: After drying, titanium dioxide is loaded into a gas chromatography column using a suction method; Step 2: The surface free energy of titanium dioxide is tested using reverse gas chromatography; Step 3: The resin is processed into a plastic plate; Step 4: The surface free energy of the plastic plate is tested using a seated drop method; Step 5: The interfacial tension and adhesion work are calculated using the surface free energy of titanium dioxide and the surface free energy of the plastic plate; Step 6: The dispersibility of titanium dioxide in plastics is evaluated based on the interfacial tension and adhesion work. The method of this invention evaluates the surface properties of titanium dioxide based on the detection of its surface free energy, which is beneficial for assessing the dispersibility of titanium dioxide in different dispersion systems. This method for predicting the dispersibility of titanium dioxide in plastics can improve the efficiency of titanium dioxide dispersibility testing in plastics, reduce labor intensity, and lower labor costs.

The invention belongs to the technical field of material surface performance detection, and particularly relates to a method for detecting biological pollution resistance and durability of a silicone rubber surface, and the method comprises the following steps: S1, sequentially carrying out biological membrane inhibition rate quantitative detection, antibacterial adhesion detection, protein adsorption resistance test and surface wettability test on a silicone rubber sample to be detected; s2, carrying out durability treatment on the parallel sample; s3, repeating partial or all tests in the step S1 on the sample treated in the step S2; s4, comparing the performance data obtained in the step S1 and the performance data obtained in the step S3, and evaluating the biological pollution resistance and durability of the silicone rubber sample. According to the invention, biological membrane inhibition rate quantitative detection, anti-bacterial adhesion detection, anti-protein adsorption performance test, surface wettability analysis and durability test are organically combined to form a complete evaluation closed loop from molecular adsorption to microbial community and from immediate efficiency to long-acting stability, and all key links of biological pollution are comprehensively covered.

The invention provides a method for rapidly predicting the surface tension of a foam extinguishing agent on site, which comprises the following steps: S1, collecting the surface tension of different types of foam extinguishing agents under different temperature conditions; s2, taking the first surface tension and the temperature measured by the thermocouple as input data, and taking the second surface tension as output data; s3, establishing a machine learning model; s4, after the model parameters are initialized, establishing a mapping relation between the input data and the output data; s5, the first surface tension and the temperature are collected again to serve as input data, and the machine learning model is adopted to predict data of the second surface tension. According to the method, the maximum bubble pressure method is improved based on high-speed camera shooting and image recognition, temperature compensation and a machine learning model are combined to predict the surface tension of the foam extinguishing agent on the fire extinguishing and rescue site, and the requirements that on-site surface tension measurement operation is convenient, the device structure is simple, and the surface tension measurement result is high in accuracy can be met.

This invention discloses a testing fixture for the water contact angle of hollow fiber membranes, including a support assembly, a carrier assembly, an adhesive assembly, a display assembly, and a lifting assembly. The support assembly is symmetrically arranged on both sides, and each of the two sets of support assemblies has a carrier assembly for placing the component on its surface. The carrier assembly has an adhesive assembly for positioning the material on its surface. This invention solves the problem of the lack of an effective method to evaluate the hydrophilicity and hydrophobicity of the inner surface of hollow fiber dialysis membranes by coordinating the components, carrier assembly, adhesive assembly, display assembly, lifting assembly, and stopwatch. The testing method is simple and effective, requiring no special tools or equipment. This testing method and fixture can meet the requirements for rapid evaluation of the contact angle of the inner surface of hollow fiber membranes at the micron level. The testing method is simple, the testing cost is low, and the test results have high reliability. Therefore, it can be used as an evaluation tool for the hydrophilicity and hydrophobicity of the inner surface of hollow fiber membranes.

This invention relates to the technical fields of aircraft component processing, testing, and inspection, and provides a method for detecting surface defects in epoxy-coated aluminum alloy plates. The method involves applying an epoxy coating containing zinc yellow pigment onto an anodic oxide film to construct a coated test piece with color difference indication function, which is then exposed to a coastal atmospheric environment for sampling. During the detection process, data such as gloss loss rate, color difference, contact angle, defect area ratio, and corrosion current density are collected. A dynamic correction coefficient is calculated based on the degree of zinc yellow pigment hydrolysis, adaptively adjusting the threshold values ​​of each parameter and constructing a threshold set. Combining scanning electron microscopy image segmentation and Tafel extrapolation analysis, multi-source indicators are integrated to determine whether the coating has failed. This method can track the hydrolysis behavior of zinc yellow pigment in real time, automatically correct the judgment criteria for optical, morphological, and electrochemical indicators, and improve the accuracy and reliability of failure detection of epoxy-coated aluminum alloy plates under coastal service conditions.

According to the embodiment of the invention, a pre-obtained test result of the breakthrough pressure of a rock core is utilized to predict the dynamic breakthrough pressure of a cap layer to hydrogen; according to the method for predicting the hydrogen breakthrough pressure of the cap layer, the dynamic breakthrough pressure of the cap layer to the hydrogen does not need to be repeatedly tested, and the dynamic breakthrough pressure of the cap layer to the hydrogen can be rapidly and accurately predicted only by utilizing the breakthrough pressure of the existing rock core and processing the breakthrough pressure of the existing rock core through the method for predicting the breakthrough pressure of the cap layer to the hydrogen provided by the embodiment of the invention; according to the embodiment of the invention, the change rule of the hydrogen breakthrough pressure of the cap layer along with the hydrogen storage pressure and the hydrogen storage time of the cap layer is found, and the blank of lack of the cap layer sealing performance evaluation method in the underground hydrogen storage field of hydrogen is filled.

The application discloses a kind of based on surface wettability of strong-flavor liquor flavor substance screening method and its application, belong to strong-flavor liquor brewing process analysis and flavor control technical field.This method is standardized by being collected to pit mud sample of different pits, different levels in spring and autumn, with ethyl hexanoate, ethanol, ethanol / water mixture and pure water as test medium, the contact angle of pit mud surface is determined, the wettability response characteristics of pit mud surface to different flavor substances and polar system are characterized.By comparing the contact angle difference of different seasons and different levels pit mud samples, pit mud level and seasonal interval with strong wettability affinity to ester and alcohol flavor substances are screened out, so as to realize the rapid judgment of liquor flavor substance distribution characteristics.This method takes contact angle as core quantitative index, test process is simple, reproducible, can provide effective technical support for strong-flavor liquor pit management and flavor control.

The invention discloses a casting powder slag entrapment resistance evaluation method, device and equipment, a medium and a product. The method comprises the following steps: acquiring a spreading image of to-be-detected casting powder after complete melting on a sample carrier, then determining a spreading area of the to-be-detected casting powder based on the spreading image, finally acquiring a reference spreading area, and comparing the reference spreading area with the spreading area to obtain the slag entrapment resistance of the to-be-detected casting powder, the reference spreading area is obtained by measuring the reference casting powder sample with the viscosity being the preset viscosity value and the slag entrapment defect occurrence rate being lower than the preset threshold value under the same test condition as the to-be-detected casting powder, and the slag entrapment resistance of the casting powder can be judged in advance before production, so that resource waste is reduced, and the productivity is improved.

The invention relates to the technical field of measurement, and provides a textile dynamic composite environment waterproof performance test method and system, and the method comprises the following steps: constructing a dynamic test environment, and setting corresponding test parameters; fixing the textile sample on a test platform, and applying a plurality of different acting forces; monitoring the water contact angle, the water permeation amount and the water repellent duration in real time; and acquiring a comprehensive evaluation index according to the monitored water contact angle, the water permeation amount and the water repellent duration, and evaluating the waterproof performance of the textile according to the comprehensive evaluation index. The comprehensive evaluation index is obtained according to the monitored water contact angle, the water permeation amount and the water repellency duration, the waterproof performance of the textile is evaluated according to the comprehensive evaluation index, the waterproof performance of the textile can be comprehensively measured, quantifiable comprehensive evaluation of the waterproof performance of the textile in a dynamic composite environment is achieved, and the waterproof performance of the textile is evaluated. And the limitation that the test dimension is relatively single in the traditional static test of the waterproof performance of the textile is overcome.

This invention provides a dyne pen ink, its preparation method, and its application. The dyne pen ink comprises ether compounds selected from ethyl carbitol and / or butyl carbitol. Through the design of the dyne pen ink components, this invention provides a novel, more environmentally friendly dyne pen ink with a 2-second observation time, without using toxic, carcinogenic, teratogenic, and reproductively toxic ethylene glycol ethyl ether. Furthermore, the dyne pen ink provided by this invention significantly improves abnormal shrinkage in smaller sizes (22-33), resulting in more accurate dyne values ​​obtained from testing, and the testing process does not significantly impact the health of the testers.

The invention discloses a moisture characteristic curve measuring device, which belongs to the technical field of soil physics, and is technically characterized by comprising a main body assembly, a wiping assembly, a beating assembly, a control assembly, a connecting assembly and a tensiometer assembly. According to the device, when cold boiled water is injected into a water injection pipe, the water injection pipe can be clamped through a connecting assembly, then a tensiometer assembly can be deflected through a control assembly, then the cold boiled water can be injected into the water injection pipe, and after injection, the tensiometer assembly can be rotated, so that the tensiometer assembly can stand; after standing for a period of time, water dripped from the surface of the pottery clay head can be wiped through the wiping assembly, and then the surface of the water injection pipe can be beaten through the beating assembly, so that bubbles in the water injection pipe can be discharged, the interior of the tensiometer assembly can be filled with cold boiled water, and operation is convenient in the water injection period.

The invention discloses a method, device and equipment for determining a dyne value of a substrate surface and a storage medium, and relates to the technical field of computers. The method comprises the following steps: acquiring a plurality of frames of test images recording the dynamic wetting process of test liquid on the surface of a base material; determining the shrinkage speed of the test liquid on the surface of the base material according to the multiple frames of test images; and determining a target dyne value of the surface of the base material according to the shrinkage speed. According to the technical scheme, the dynamic change of the wetting process is recorded and quantitatively analyzed through multiple frames of images, the corresponding relation between the shrinkage speed and the dyne value based on image calculation is more accurate, the random error of manual visual judgment is remarkably reduced, and the test result has good repeatability and comparability.

A method for determining physical parameters of a liquid (22) to be aspirated and / or dispensed by a laboratory automation device (10) comprises: pickup of a pipette (14) with the laboratory automation device (10); lowering the pipette (14) into a sample container (18) with the laboratory automation device (10), the sample container (18) containing the liquid (22); aspirating and dispensing air and liquid (22) with the laboratory automation device (10) in such a way, that a liquid level in the pipette (14) solely rises in a first step and solely lowers in a second step, such that an interior surface of the pipette (14) is wetted with liquid solely one time; and during aspirating and dispensing air and liquid (22), measuring a pressure curve (40) in the pipette (14) and determining the physical parameters from the pressure curve (40), the physical parameters comprising at least one of a surface tension, a wetting angle and a viscosity.

The invention relates to the technical field of alcohol detection, in particular to a preparation method of a metal-based energy-consumption-free alcohol detection material and an application method of the metal-based energy-consumption-free alcohol detection material in alcohol concentration detection and alcohol molecule recognition. A continuous groove micro-nano structure is machined on the surface of a substrate material, chemical composition is changed, and the continuous groove micro-nano structure comprises a plurality of grooves with preset widths, perpendicular to the length direction, in a laser processing area with the preset length; the depth of the groove is 8-12 microns, and the width of the groove is 30-40 microns; the alcohol concentration can be identified according to the diffusion length of alcohol on the surface, and meanwhile whether gas contains alcohol or not can be detected by changing the surface contact angle and the rolling angle. The substrate material is convenient and rapid to prepare and low in cost, and the method for detecting the alcohol concentration and identifying the alcohol molecules is simple to operate, saves a detection solvent and is short in time consumption.